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Unit 2 - Lesson 8 - Grade 2: Illustrative Mathematics

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Last updated 2 months ago
13 Questions
Note from the author:
Grade 2 Unit 2
Lesson 8: Different Ways to Decompose
CC BY 2021 Illustrative Mathematics
Grade 2 Unit 2
Lesson 8: Different Ways to Decompose
CC BY 2021 Illustrative Mathematics
Lesson: Different Ways to Decompose

Number Talk: Multiples of 10 (Warm Up)

1.

Find the value of each expression mentally.

2.

Find the value of each expression mentally.

3.

Find the value of each expression mentally.

4.

Find the value of each expression mentally.

Aren’t You Missing Something?

5.

Lin and Clare made base-ten diagrams to find the value of 71 - 56.


What do you notice about their work? What do you wonder?

6.

Lin and Clare each wrote equations to show their thinking. Explain how you know which group of equations matches Lin’s work and which matches Clare’s work.

7.

How are Lin and Clare’s methods the same? How are they different?

Different Ways to Decompose

8.

Andre found the value of 65 - 28. He made a base-ten diagram and wrote equations to show his thinking.


Do you think Andre’s method is more like Clare’s or Lin’s method? Explain.

Find the value of each difference. Show your thinking.
9.

10.

11.

Cool Down: Whose Method is it Anyway?
12.

Whose Method is it Anyway?

Mai and Lin were asked to find the value of 63 - 18. Compare their methods.


Name 1 thing that is the same about Mai and Lin’s methods.

13.

Whose Method is it Anyway?

Mai and Lin were asked to find the value of 63 - 18. Compare their methods.


Name 1 thing that is different about Mai and Lin’s methods.